Microbiology Quiz Questions

Respiration

• Respiration is defined as a sequence of carrier molecules with an inorganic molecule as the final electron acceptor.
• It is not the same as generating ATP, although ATP is generated during respiration.
• Complete oxidation of glucose to CO2 and H2O is also not the definition of respiration, but rather a process that occurs during respiration.

Sterilization

• Autoclaving, incineration, and hot-air sterilization are all effective methods for killing endospores.
• Pasteurization is not effective against endospores.

Sterilization Methods

• Gamma radiation, ethylene oxide, and supercritical fluids can be used to sterilize heat-labile solutions stored in plastic containers.
• Autoclaving and short-wavelength radiation are not suitable for this purpose.

Capsule and Virulence

• The capsule of an encapsulated bacterium can contribute to its virulence by resisting phagocytosis.
• The capsule is not an endotoxin, nor does it destroy host tissues or kill host cells.

Bacterial Identification

• Comma-shaped bacteria that require 2-4% NaCl to grow are likely to belong to the genus Vibrio.
• This distinguishes them from Campylobacter, Escherichia, Salmonella, and Shigella.

Disease Causes

• Rheumatic fever is most commonly caused by Streptococcus pyogenes.
• Streptococcus viridans, Staphylococcus aureus, and other bacteria are not typically associated with this disease.

Bacitracin Sensitivity Test

• The Bacitracin sensitivity test is used to identify Group A streptococci.
• It is not used for Pneumococci, Gonococci, or Staphylococci.